I have read quite a few reports (mainly Honest John] stating how Michelin Cross climates improve ride comfort and noise levels, but none for an RX. Have you experienced notably improvements with these tyres? My 450h is shod with Bridgestones and I find road noise to be unacceptable, compared with previous Lexus' I have had.so, whilst the Bridgestones are not exactly at the end of their useful lives, I am tempted to change them. I would be grateful for your response.